World War I will be remembered as one of the bloodiest wars in human history. Millions of soldiers died on both sides, and whole generations of young men were wiped out. Armies were bogged down in impenetrable trenches, resulting in thousands dying in futile assaults against fortified enemies. The war also introduced new and terrible weapons, such as the machine gun, which made the war even more horrific and bloody. There were many terrible battles, but the worst one for the American...